Concrete form wall and tie



April 1, 1941. G. B. Bosco CONCRETE FORM WALL AND TIE 3 Sheets-Sheet 1 Filed Feb. 2. 1938 lll April l, 1941. G, B Bosco 2,236,616

concurra Form wm. AND TIE Filed Feb. 2, 1958 5 sheets-sheet 2 Y 7; W f@ P 1, 1941 G. a. Bosco CONGRETE FOR WALL AND TIE Filed lFeb. 2, 1938 Patented Apr. 1, 1941 UNITED STATES PATENT OFFICE CONCRETE FORM WALL AND TIE George B. Bosco, Chicago, Ill.

Claims.

This invention relates to the art of concrete form walls and ties therefor, and has reference more particularly to forms of the well known panel type wherein the form walls are constructed of a'group of rectangular panels assembled edge to edge to Abuild up'the complete wall forming one side-of the form in which the concrete is poured, and the two walls are connected by tie rods to prevent the walls from bulging under the thrust of the wet concrete. The panels used in this type of' walls usually consist of a facing of plywood against which the concrete lies, and a sti'ening and strengthening frame applied to the outer side of the facing, such frame usually including bounding frame bars attached to the marginal portions of the facing and intermediate cross-bars which extend horizontally or vertically or both between and at their ends connected to opposite marginal or bounding frame bars. The wall, assembled from the edgewise connected panels, is often of considerable length, and it is further stliened, and the panels maintained vin longitudinal alinement, by heavy longitudinal stringers or walers that extend horizontally across the outer sides of the panels, and where the wall is of considerable height, vertical stringers 'are also used to maintain vertical alinement of the panels.

Among the objects of the present invention are, to provide an improved means for tying or bonding 4together the two opposed walls of a form of this panel type, to provide improved means for anchoring the tie rods to the adjacent marginal frame bars of two adjacent panels, to provide improved means for connecting the bounding frames of adjacent panels to each other and utilizing such connecting means as tie rod anchors, to provide means associated with the tie rod anchors for wedging the stringers hard against the panel frames, and, generally, to provide an improved concrete form of the panel type which can be easily assembled and disassembled.

Still other objects and attendant advantages of the invention will be apparent to persons fami1 iar with the art to which the invention relates from the following detailed description, taken in connection with the accompanying drawings which illustrate selected and approved embodiments of the invention, and in which- Fig. 1 is an outer side elevation of a fragment of a side Wall of a concrete form, showing four` edgewise connected panels.

Fig. 2 is an enlarged fragmentary vertical section taken on the line 2-2 of Fig. 1.

Application February 2, 1938, Serial No. 188,219

' 3--3 0f Fig. 2.

Fig. 4 is a fragmentary inner side elevation viewed on the line 4 4 of Fig. 2, showing a tie rod in cross-section.

Fig. 5 is a perspective detail of one form of tie rod.

Fig. 6 is an elevation of the tie rod shown in Fig. 5, showing the same embedded in a concrete wall with the loop at one end cut olf, and an extractor engaged with the loop at the other end.

Fig. 7 is a vertical transverse section through a filled concrete form, taken in a plane between two adjacent panels on each side, and showing a modified form of tie rod which combines therewith wedge-actuated means for forcing the stringers hard against the outer sides of the panels.

Fig. 8 is a vertical section, similar to Fig. 2, but showing a modified form of device for forcing the stringers hard against the outer sides of the panels.

Fig. 9 is a horizontal section, similar to Fig. 3, but showing a modified form of tie rod anchor bolt.

Fig. 10 isa horizontal section, similar to Fig. 9 but on a larger scale, and showing another form of tie rodand anchor bolt therefor.

Fig. 11 is a sectional detail taken on the line Il-II of Fig. 10.

Fig. 12 is a fragmentary elevation, in section Ithrough the stringers and wedge, of a modification of the combined tie rod and Stringer bonding device shown in Fig. 7.

Fig. 12a is a fragmentary plan section taken on the line I'21--I2a of Fig. 12.

Fig. 13 is a horizontal section, similar to Fig, 3. but showing the use Vof a rubber strip between adjacent edges of adjacent panel facings to exclude concrete.' I

Fig. 14 is a vertical section taken on the line ll-M of Fig. 13.

Fig. 15 is an enlarged vertical section taken on the line I5-I5 of Fig. 1.

In Fig. 1 of the drawings I have shown a portion of a form wall made up of four rectangular panels A, B, C and D. The end` panels rA and B are shown as full height panels, while the intermediate panels C and D are half-height panels, Vbut this particular arrangement is iml material and any other arrangement may be employed. I have also shown the four panels as embodying slight structural differences to illustrate variations of panel structure which may be employed. but it is to be understood that all or any part oi the panels may be structurally identical within the purview of the invention.

Describing iirst the structural features that are common to all of the panels shown, 2l designates a rectangular plywood facing, to the outer edge portions of which are applied sheet metal angle strips 22, best shown in Fig. 15. To the outer face of the panel is attached a marginal or bounding frame consisting of top and bottom horizontal bars 23 and 24 respectively and vertical side bars 25. The facing 2l is attached to these bounding frame bars by screw-type nails 25 (Fig. 15), and said nails are covered and concealed by an outer lamination or veneer 21, the edges of which are also covered by the transverse limbs of the angle strips 22.

Opposed marginal frame bars are connected by intermediate bars which may extend either vertically or horizontally, or both. In panels B and D I have shown a series of horizontal intermediate bars 28, extending between the vertical marginal bars 25, in panel C I have shown vertical intermediate bars 29 extending betweenwthe top and bottom marginal bars 23 and 24, and in panel A I have shown long intermediate vertical bars 29 connecting the top and bottom bars 23 and 24, and horizontal intermediate bars consisting of headed rods 3i extending between the side marginal bars 25 and sleeves 32 encircling the rod 3l for spacing and stiifening the vertical bars 29.

A simple and eficient means for connecting the ends of the intermediate frame bars 28 and 29 as well as the top and bottom marginal frame bars 23 and 24 to the bars which they connect is best shown' in Fig. 15, and consists of a metal strap bent to form a rectangular loop 33, and an attaching lug 34 at the upper outer corner of the loop consisting of overlapped end portions of the strap, which lug is attached to the end of the intersecting frame. bars such as 28, 29, 23 or 24 by a screw-.type nail 35. Similar nails 35' driven through the loop 33 and the frame bar 24 and into the cross bar 29 additionally secure loop 33 to the end of bar 29.

Describing next the means for separably connecting adjacent panels edgewise to each other, to the adjacent outer corners of adjacent marginal frame bars such as 25 are applied at intervals metal angle pieces such as are shown at 36 in Figs. 3, 8; 9, 10 and 13, which may be secured in place by screw-type nails 31. These angle strips have registering holes 33 that register with holes 39 extending through adjacent parallel frame bars. In Fig. 3 I have shown a tie rod anchor bolt 4l extending 1through said holes 38 and 39 and projecting through and beyond :the inner sides of .the frame bars 25. On one end of the boit 4I is an apertured head 42 by which the bolt may be readily withdrawn in taking down the form, while the opposite projecting end of the bolt is formed with a neck 43 and a head 44 adapted to cooperate with a bolt tightening wedge 45 that straddles the neck 43 and has a cam surface 46 (Fig. 1) cooperating with the head 44. 'I'he same bolt 4i is shown in Fig. 13. In Fig. 9 and Figs. 10 andll are shown variants of the bolt, Fig. 9 showing a bolt 41 formed with a neck and head at both ends, cooperating with two wedges 45; and Figs. 10 and 11 showing a heavier bolt 48 cored longitudinally to form a chamber 49 opening Ato the surface of the bolt through a longitudinal slot I, the side walls of said slot formed on their inner edges with low 75 4 length of the wall.

longitudinal cams 52 for a purpose later described. The bolt has on one end an apertured head 42 and in its opposite projecting end is a transverse slot 53 through which may be driven a plain wedge block 54 to lock the bolt in place.

As is shown in Fig. 15, adjacent edges of adjacent panel f-aclngs may extend slightly beyond their marginal frame bars and lie :in contact with each other, so as to prevent entrance oi concrete between -the marginal frame bars and provide a space between lthe latter for the passage of tie rods and stringer clamping connections. A modiiication of this concrete excluding means is illustrated in Figs. 13 and 14, where the adjacent edges of the facings are spaced apart and between them is inserted a solid rubber spacing strip 55 preferably formed with a head 55 that projects a short distance into the interior of the form. This head 55, of course, molds grooves in the face of .the concrete which may serve to give an ornamental character to the face of fthe concrete wall and, in the case of building walls, create an eiIect of a concrete block structure.

Describing next the means for bonding together the two side walls of the form against spreading under .the thrust of the wet concrete, this bonding means preferably takes the form of a tie rod 51, shown in isolated detail in Fig. 5. said rod having its end portions bent inwardly to form loops 58 .that embrace the panel connecting bolts such as 4I and 41, the end portions of the loops being spot-welded rto the rod 51, as indicated at 59 to prevent the possibility of the loops pulling out. The loops 58 are preferably made substantially round to nt the bolts so that the tie rods serve as both tension and compression members. A modiiled form of this bonding member is shown in Figs. 10 and l1, and consists of a heavier rod 51' formed on each end with a head 6I that can be entered into the chamber of the bolt 48 through its open end and is of a size .to slidably engage the cams 52, the body of the bolt just inwardly of the head occupying .the slot 5I.

Where such tie rods are located at points lying between the longitudinal stringers (hereinafter described) .the angle pieces 35 serve the useful function of preventing-the splitting of the panel frame bars through which the anchor bolts pass under the tensional strain imposed on the tie rods by the lateral thrust of the concrete on ,the walls, since these `angle pieces 36 serve to transmit the tension strain of the tie rods to the outer surfaces of the frame bars. Where the .tie rod 51 intersects the metal-shod joint between adjacent edges of the facing, as shown in Figs. 2, 3 and 4, a hole sulcient to accommodate the rod is formed through 4the meeting edges, as shown in Fig. 4; and where the `tie rod extends .through the rubber illling strip 55, (Figs. 13 and 14) a hole is also formed through the strip to admit the passage of the rod.

Extending lengthwise of the upper and lower portions of the outer sides of the assembled panels'are pairs of longitudinal stringers, the purpose of which is -to maintain the longitudinal alinement of the panels throughout the full Each pair of stringers consists of bars 62 and 53 that alternate lengthwise and are slightly oiset vertically so that their end portions overlap at vertical joints between adjacent panels. Each stringer bar is long enough to span several panels, and at the vertical panel joints intermediate the joints which are covered by the overlapping ends, I supply short stringer blocks 54 (Fig. 1) of the same thickness as, and lying in the horizontal plane of, the stringere 53.

4I, and at its outer end with a head 61 that is engaged by the cam surface 46 of one of the wedges 45. A downwardly oiset integral arm 68 of the link 65 underlies the bottom side of the Stringer 63, to prevent accidental displacement of the hook 66. Maniiestly, by driving down the Wedge 45 the stringers 62 and 63, or 64, are forced hard against the panel frame bars "i and 28, so that the entireline of panels spanned by the stringers is maintained straight and in the same vertical plane.

Variants of this Stringer bonding means are shown in Figs. 7, 8 and 12. In the form shown in Fig. 7 the members 65, 66, 68 of Fig. 2 are replaced by a straight rod 69 that is all of a length with the tie rod 51a, with circular loops H at their junctions which encircle the anchor bolts 4I, with the crossing portions of the loops .preferably spot-welded together as indicated at l2 to prevent deformation or sliding of the loop under the tensional strain. In the form shown in Fig. 8, the stringer bonding tension member 69 is similar to the member 69 of Fig. 7, but is not an integral continuation of thc tie rod and at its inner end is formed with a loop 'I3 that encircles the anchor bolt 4| alongside the loop 58 of the tie rod 5T. In the form shown in Fig. l2, .he tie rod and Stringer bonding member are continuous, somewhat as in Fig. 7, but are separable, and consists of a tie rod 51b having threaded ends and links each comprising a flat shank 14 formed with a hol-e 15 throughwhich the anchor bolt 4l ext-ends and, integral therewith, a round tapered head 16 having a tapped hole 11 in its end to receive the threaded end of the tie rod 51h. The shank 14 extends between the stringers 62 and 63 and its outer end has a head 18 and a neck 19 that is straddled by the twin limbs of the wedge 45.

Where tie rods of the general type herein d shown and described are employed for bonding the side walls of the form against spreading, after the concrete has set and the form is taken down the projecting ends of the tie rods are usually cut off, the body of the rod being left in the concrete. And even though the surface of the concrete be painted, the ends of the rods will rust and show up as brown spots through the paint, which gives an unsightly appearance to a dress wall. To avoid this, if the tie rod can be pulled out a hole is left which can be closed by a small plug of cement that does not show up in contrast with the nlsh of the wall. To enable this latter to be done, I have designed a simple and effective means for extracting the tie rods from the concrete wall. which is illustrated in Fig. 6, in which W designates the concrete.

wall in which the tie rod 51 is embedded. When the form is taken down, the loop 58 on one end of the tie'rod is cut off as indicated at 8|, and the loop at the other end is engaged by a simple puller device consisting of a long rod 82 having at one end a hook 83 engaged with the other loop 58 of the tie rod and at its other end a head 84. Slidable on the rod 82 is a hand-operated weight 85 that, by a series of blows on the head 84 loosens the grip of the concrete on the tie rod 51 and pulls the latter out.

I have herein shown and described practical and workable embodiments of the several features of the present invention, but I wish it to be understood that the forms shown are illustrative and not limiting of the invention except to the extent clearly indicated in specific claims.

I claim:

1. In a form of the class described, the combination with spaced walls of the panel type, and bolts connecting adjacent panels of each wall edgewise to each other, of stringers overlying the outer sides of said walls, tie rods extending through said Walls and anchored at their ends to said bolts, links anchored on said bolts and extending 'past said stringers, and wedge means for simultaneously forcing said links and stringers in opposite directions.

2. A form as dened by claim 1 wherein the tie rods and links are integrallyl connected by loops encircling said bolts.

3. In a form of the class described, laterally spaced form Walls each including rectangular y panels disposed edge to edge, each of said panels comprising a facing and marginal frame bars secured to the outer side of said facing, means spacing laterally adjacent frame bars of adjacent panels, means connecting said panels comprising bolts extending through registering holes in laterally adjacent frame bars, and means-bonding said form walls together against spreading comprising tie rods each formed on its ends with loops encircling corresponding bolts in the laterally spaced form walls.

4'. In combination with a form structure as defined by claim 3, means transmitting the tension strain of each tie rod to the outer faces of laterally adjacent frame bars.

5. In combination with a form structure as defined by claim 3, metal angle pieces respectively overlapping and secured to the opposed inner sides and outer faces of laterally adjacent frame bars and anchored to the bolt extending through said frame bars, whereby the tension strain of the tie rod is transmitted through said bolt and angle pieces to the outer` faces of the laterally adjacent frame bars.

GEORGE B. BOSCO. 

